Triangle Area Calculator
Calculate triangle area three ways — base and height, three sides (Heron), or two sides plus included angle. Pick the method matching your knowns. Numbers never leave your device — every calculation runs locally in your browser.
How to Use the Triangle Area Calculator
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Frequently Asked Questions
Which inputs does triangle area need?
Base-height, three sides (Heron), or two sides plus included angle.
Which units for triangle area?
Any consistent unit — output squares it automatically for your convenience.
Why three methods?
Different knowns need different formulas — pick what you have.
Is my triangle input uploaded anywhere?
No — calculation runs locally in your browser, free with no signup.
Area of a triangle with base 10 and height 6?
Half times base times height: 0.5 × 10 × 6 = 30 square units. Select Base & Height with 10 and 6 to retrace it.
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Last updated October 2026